@jens Sorry for the delay in reply. The Node.js upgrade from 4.6.x to 4.9.x should work fine without the need to re-install pimatic. If there are issues though you can downgrade to 4.6.3 again. In any case it is recommended to make backups

Please also note I said “should work” as I have not tested this particular case. It should also be noted issues are likely to occur if a major version upgrade (e.g. Node.js 4.x to 8.x) is performed.